STEEL SHEET FOR HOT FORMING AND METHOD OF MANUFACTURING HOT-STAMPED STEEL ELEMENTS Russian patent published in 2017 - IPC C22C38/14 B21D22/20 C21D9/46 

FIELD: metallurgy.

SUBSTANCE: steel sheet includes, in wt %, C: 0.15 to 0.35, Si: 1.0 to 3.0, Mn: 1.0 to 3.0, Al: more than 0 up to 0.10, Ti: from ([N]×48/14) to 0.10, where [N] is the amount of N in the steel sheet, B: from 5 million^-1 up to 50 million^-1, P: more than 0 up to less than 0.015, S: more than 0 up to 0.010 and N: more than 0 up to 0.010, the residue is iron and related impurities. The average oxygen concentration from the outer surface of the steel sheet to a depth of 10 mcm in the thickness direction of the sheet is 0.70 wt % or more.

EFFECT: improved quality of hot stamping due to stable and reliable suppression of scale shedding, peeling during stamping.

5 cl, 6 wg, 3 tbl, 2 ex